public class Circular {
 Circle bottom;
 double height;
void setBottom(Circle c) {
  bottom =c;
}
void setHeight(double h) {
  height =h;
}
double getVolme() {
  if(bottom ==null)
  return -1;
else 
  return bottom.getArea()*height/3.0;
}
double getBottomRadius() {
  return bottom.getRadius();
}
public void setBottomRadius(double r) {
  bottom.setRadius(r);
}
}
